A Republican U.S. Senate showdown highlighted Florida's primary. Republicans chose between U.S. Rep. Connie Mack IV, former Congressman Dave Weldon and tea party favorite Mike McCalister. The winner is expected to face incumbent Bill Nelson, who had token opposition in the Democratic primary.

Mack is a heavy favorite in the GOP Senate race. His father, Connie Mack III, is a former senator and his great-grandfather was a Hall of Fame baseball manager and he has benefited from a better-financed campaign. Nelson, a former congressman and state treasurer and insurance commissioner, is seeking a third term.